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Well, we dont have any problems. Besides, Ive built numerous rally cars. Open air filters give problems if you feed them hot air, if not, why should they give problems? All you do is give easier access to more air, give me one reason why this should cause overfueling? Gijs

If you fit an open-air filter kit of some sort, make sure you take time to construct some sort of heat shield. Otherwise youll only loose power due to the hot air youre taking in. And 10% from a chip is quite a lot, expect less. For the rally car were considering taking the chip from Renault...

Cant think of any reason why it would screw up your fueling??? I have the simpel cone filter from Pipercross fitted on my 172mk1 group N rally car. It works fine, just make sure it doesnt get too much hot air, so make a little heatshield or something, it a DIY job... Gijs